Sad😔

Ladies I just need to vent my sadness. I am a working mom (more specifically a teacher). I knew when I got pregnant that it is very hard to balance taking care of a baby and working at the same time. From the beginning I've wanted to prioritize spending time with her (I have major mom guilt about working all day). I have a wonderful mother in law who takes care of my daughter from 7 am-3:30pm. As soon as I get off work I pick up my daughter and spend the rest of the day with her until she sleeps which is at 9 or 10pm. I still feel extremely guilty. And just recently I've noticed my daughter doesn't cry for me when I say bye bye anymore. She cries for my mother in law and won't leave her. I've recently had a week off and I spent all day with her but now in the past 2 days she cries hard for my mother in law when she sees her after I take her at 3:30. She used to cry like that for me 😔 And she started calling my mother in law mama which is what she calls me. Is it bad that I feel so extremely sad over this? My daughter is my life and I lived for those sweet cries while saying mama and now she's doing that for someone else instead of me. And she doesn't even noticed that I'm gone. I'm currently in a position where I cannot leave my job as I help provide for my daughter and on top I absolutely love my job. But I feel so overwhelmed with sadness today over this 😔 I feel like my little baby doesn't feel connected to me anymore 😭

Sorry if I sound selfish.